.NET (Core and Framework)

public class MyForm : Form 
{ 
    public MyForm() 
    { 
        this.extraColor = Color.Red; 
        this.extraValue = 0; 
        this.layerData = new LayerData(); 
    } 

    public Color ExtraColor 
    { 
        get { return this.extraColor; } 
        set { this.extraColor = value; } 
    } 
    bool ShouldSerializeExtraColor() 
    { 
        Color color; 
        if (this.extraValue == 0) color = Color.Red; 
        else color = Color.Blue; 
        return !(this.extraColor == color); 
    } 

    public int ExtraValue 
    { 
        get { return this.extraValue; } 
        set { this.extraValue = value; } 
    } 
    bool ShouldSerializeExtraValue() 
    { 
        return !(this.extraValue == 0); 
    } 

    private int extraValue; 
    private Color extraColor; 
} 

public class Form1 : MyForm { ... }